Fritz kohli



F. KHLI. WATCH ST1-:M FASTENBR.

(No Model.)

No. 566,586. Patented Aug. 25, 1896.

UNITED STATESv PATENT Prion.-

FRITZ KHLI, OF BIENNF., SVITZERLAND, ASSIGNOR TO EMILE FLOTRON,'

' OF MADRETSCH, SWVITZERLAND.

WATCH-STEM FASTENER.

SPECIFICATION forming part of Letters Patent No. 566,586, dated August 25, 1896.

Application led February 3, 1896. Serial No. 577,872. (No model.)

To @ZZ whom t may concern:

Be it known that I, FRITZ KHLI, watchmaker, of Bienne, canton of Berne, Switzer land, have invented certain new and useful Improvements in and Relating to Stern- IVinding XVatches, of which the following is a specification.

My invention relates to devices for connecting or coupling in stem-winding watches 1o the stem of the movement with the stem eX- tending through the pendant from the crown, and also for fastening the watch-movement in its case. In these watches itis essential that the stem be longitudinally movable, so as to operate either the winding or hand-setting mechanism, and this must be effected without disengaging the coupling device.

In carrying out my invention I provide a pin extending centrally across the stem of 2o the watch-movement and having projecting ends, and the lower end of the stem from the crown extending; through the pendant is made with a coupling-head having an open center and a groove across the under face of 2 5 the head with bayonet-slots at the base of the groove. rlhis head iits over the stem of the movement and the pin across this stem is received in the groove of the head, and a partial rotation of the head causes the ends of 3o the pin to move into the bayonet-slots, and a coiled contractile spring acting over the head causes the parts to normallyT remain in engagement when the crown is turned in either direction, and the pin in the bayonet- 3 5 slot keeps the parts together when moved longitudinally to change from the winding to the hand-setting position.

In the drawings, Figure l is a cross-section and partial elevation showing the case for 4o the watch-m ovement partially inserted in the outer case. Fig. 2 is a cross-section at the pendant, showing parts of the cases as connected. Fig. 3 is an elevation of the crown,

stem, and head. Fig. 4 is an inverted plan of the same, and Figfis a side elevation of part of the coiled spring and the head and stem upon which it acts.

The watch-case D and its pendant and the movement-case E are of well-known construc- 5o tion and do not require further description.

IVithin and around the inner surface of the case D is a coiled contractile spring C, and the movement-case E is made with a rib e to engage the case, as shown in Fig. l.

The movement is provided with a stein B, across whose upper end is centrally located a pin b, whose ends project.

rIhe stem A is connected to the crown A and passes through the said spring C, and on the lower end of said stem A is a coupling- 6o head a, having an open center and a groove a across its under face and bayonet-slots in the head at the base of the groove.

In the position Fig. l the crown is moved aside and supported on the upper edge of the pendant with the stem A inclined in the pendant, and the spring C is bent outward and under tension. In this position the movement-case E is inserted in the case D. The crown and stem are then moved to the 7o center of the pendant and the spring C draws the same down with the head a resting on the stem B. The head is now turned by the crown and the groove a brought into line with the pin h. In this position the spring moves the head a down over the pin, and a partial rotation of the crown causes the pin Z) to enter the bayonet-slots. The parts are now connected and locked together, as shown in Fig. l. In this position the crown and 8o stem may be rotated to wind up the mainspring or the stem may be moved longitudinally and turned to effect the hand-setting operation without disengaging the parts.

With the parts in the position Fig. 2 the 85 coupling-head a and stem B are kept together and the crown can be rotated in either di rection without the parts becoming separated.

If the crown and stem are moved in the re* verse direction, and also moved longitudi- 9c nally, a separation is effected that releases the stem B, so that the movement and its case can be taken from the case D. This coupling device may be inverted, that is, the coupling-head a may be upon the stem B and the pin b be upon the stem A, without altering the operation of the parts or changing the character of my invention, except that in this case the stem would be notched and the end of the spring C forked to take a bearing roo therein, as in Letters Patent granted to me September l7, 1895, No. 546,543.

I claim as my inventionl. The combination with a watch-case having a side opening and pendant and a removable movement ease and stem, of the crown and stem, a coupling-head having a hollow center, a cross-groove in one face and bayonetslots in opposite directions at the base of the groove upon the end of one stem, and a crosspin upon the adjacent opposing end of the other stem, the groove and bayonet-slots receiving the cross-pin for coupling the stems of the movement and crown together, and a Spring acting downward for holding the parts in contact and the crown in place, Substantially as set forth.

2. The combination with a watch-case havin g a side opening and pendant, and a removable movement case and stem, and a crosspin through the upper end of the movementstem, of the crown and its stem, a couplinghead on the crown-stem and having a hollow center, a cross-groove in its under i'aee and hayonetslots in opposite directions at the base of the groove to :receive the respective ends of the said cross-pin, and a coiled contractile spring around within the watch-ease and acting downward over the eouplinghead to hold the parts in engagement with the stem of the movement and the crown in place, substantially as set forth.

In testimony whereof I have signed my name to this speeiieation in the presence ofi two subscribing witnesses.

FRITZ KOIILL lVitnesses:

E. MER-SCHNEIDER, EMILE FLo'rnoN. 

